Spark-plug.



s. J. TODD.

SPARK PLUG.

APPLICATION FILED DEC- 17. 1914.

- Elmwzntoz fimmiu i SAMUEL J. TODD, OF HIGHLAND PARK, MICHIGAN, ASSIGNOR OF THREE-FOURTHS SPAEK-PLUG.

1,1cs,a21.

Specification of Letters Patent.

Patented Jan. 18, 1931.

Application filed December 17, 1914. Serial No. 877,738.

.device disclosed in my pending application filed Nov. 30, 191d, Serial No, 874,649. B csides having the same objects in view as d1sclosed in this pending application, the pres ent invention aims to provide a novel insulater or porcelain body for spark plugs that will form a reservoir in the body of plug for gasolene or a priming fluid, which is transferred, in measured or predetermined quantities, to the electrodes of the spark plug.

My invention will. be hereinafter spec1fically described and then claimed, and refer ence will now be had to the drawing, wherein there is illustrated a vertical sectional view of a combined spark plug and priming device in accordance with my invention.

The reference numeral 1- denotes a spark plug body made of metal with the lower end thereof reduced and exteriorl y screw-threaded, as at 2, whereby the spark plug body can be mounted in or connected to the wall 3 of a multi-cylinder explosive engine. The spark plug body 1 has a longitudinal cylindrical bore 1 and the upper end of said bore is enlarged to provide an annular shoulder 5 and a. cylindricalchamber (l.

7 denotes an insulator or porcelain body of less diameter than the chamber ll, said body having collars or peripheral flanges 8 and 9 engaging the walls of the chamber 6 and positioning the body 7 crmccntrically of said chamber. The lo wcr end of the body 7 extends into the bore t and the lower side of the collar 9 is beveled, as at 10 to rest upon a washer 41 seated upon the annular shoulder 5. The upper end 11 of the porcelain body 7 extends above the spark body 1 and is surrounded by a nut 12 screwed in the upper end of the spark plug body 1, said nut engaging a washer 13 upon the upper side of the collar 8.

14 denotes a longitudinally disposed valve body carried by the spark plug body 1, said valve body having tapering longitudinal bore 15 for a valve plug 16. The plug 16 is rotatable in the bore 15 and is retained therein by a nut 17 or other fastening means at the lower end of the valve plug. The upper end of the valve plug is reduced and machined to provide a small pinion 18 that meshes with a large pinion 19 rotatable upon the nut 12. The large pinion 19 has a radially disposed crank 20 to facilitate r0- tating the pinions whereby movement is im parted to the valve plug 16. The crank 20 can be operated through the medium of a lever 21 common to a plurality of the devices, and the elements 18 to 21 inclusive,

simply constitute a conventional means of imparting movement to the valve plugs of the devices.

The valve plug 16 has a chamber 22 adapted to hold a predetermined quantity of gasolone or other fuel. The plug 16 has a port 23 at the upper end of the chamber 22 and the port 23 is adapted to communicate with a port 24 in the valve body 14 establishing communication between tl1e bore 15 of the valve body 14 and the chamber 6 of the spark plug body 1.

The valve plug 16 intersects an angularly disposed port 25 that has the inner end thereof in communication with the bore 4; of the spark plug body 1. The outer end of the port 25 is closed by a detachable plug 1 26, and the lower end of the valve plug 16 has a port 27 adapted to establish communi-' vvalve plug 113 alteri'iatcly establishes comnuinication between the ports and 24 and the ports and 97.

The wall of the spark plug body 1, opposite the port 24:, has a port 2b with the walls thereof scrcwthrcadcd to receive a supply tube or pipe 29 adapted to be connected to a gasolene or fuel resorvoi. (not shown). (lasolcnc or fuel can be fed to the priming device by gravity, pressure feed, or in any manner that will maintain a constant sup ply to the priming devices of a-multiple cylinder explosive engine.

The porcelain body 7 and the collars 9 thereof, cooperate with the walls of the chamber 6 in forming an annular reservoir or compartment 30 for gasolene or fuel. With the valve plug 16 in theposition shown in the drawing, the chamber 22 of said valve plug receives gasolene or fuel from the reservoir 30 and by-rotating the valve plug 16 a half revolution the port27 registers with the port 25 and the measured quantity of gasolene is delivered to the bore 4 of the spark plug body 1. The lower end of the spark plug body 1 has an electrode l cooperating with an electrode 32 of the porcelain body 7 in producing a jump spark which ignites the gasolene or fuel admitted to the bore 4, causing an explosion for starting purposes. As porcelain body 7 is capable of absorbing and holding heat, the gasolene or fuel in the reservoir 30 will. be heated and placed in better condition-for ignition.

From the foregoing it will be observed that I have dispensed With the metallic reservoir around the porcelain disclosed in my pending application, also'packing incident to the use of the reservoir. In the present instance the collars 8 and 9 of the porcelain body 7 form an important function and the Washers associated with said collars insure a non-leakable reservoir around the porcelain body.

While in the drawing there is illustrated a preferred embodiment of my invention, it is adapted to receive fuel for priming purdevice, a spark plug body, an electrode and an insulator for said electrode in said spark poses.

2. In a combined spark, plug and priming plug body cooperating with said body in forming an annular reservoir adapted to receive fuel to be heated by said insulator for priming purposes.

3. In a combined spark plug and priming device, a spark plug body, an electrode, a porcelain body in said spark plug body as an insulator for said electrode and providing an annular fuel reservoir, and means carried by said spark plug body for transferring measured quantities of fuel from the reservoir to the inner end of said body.

t. The combination with a spark plug body and an electrode, of an insulator therein for said electrode and providing an annular fuel reservoir, and means carried by said spark plug body controlling the outlet of fuel from the reservoir.

5. The combination with a. spark plug body, and an electrode of a porcelain body therein as an insulator for said electrode, collars carried by said porcelain body and cooperating with said spark plug body in providing a. reservoir, and a valve in communication with the reservoir for control ling the outlet thereof.

6. The combination with a Spark ,plug' 'valve plug in the valve body adapted to alternately register with the ports of said valve body.

7. The combination with a spark plug body and an electrode cooper'ating'therewith in providing a spark gap of an insulator for said electrode in said spark plug body cooperating therewith in providing a reservoir, a ported valve body in communication with the reservoir, a chambered valve plug in the valve body adapted to alternately register with the ports of said valve body, and means on the upper end of said spark plug body for imparting movement to said valve plug.

8. In a spark plug having an electrode providing a spark gap, a body of insulation material for said electrode, means for maintaining fuel in communication with said body of insulation, and means incommunication with said fuel containing means adapted to deliver predetermined quantities of fuel to the inner end of the spark plug.

In testimony whereof I aflix my'signature in presence of two witnesses.

SAMUEL J. TODD. 

